OK, I'm stumped. What's the difference between the Eurocharged "65" and "61" pulley? It looks like the comparison curves on the EC website are still showing only the "65" results. And the little table that used to show boost/HP/torque for stock vs the pulley is gone.

What is the peak boost/HP/torque for each of the two pulleys? A new curve showing the entire power band would be really helpful.

Also, it seems that the stock, Code 3, and the original EC 65 pulley were all steel. But EC has gone to aluminum with both sizes now. Strength of the aluminum is adequate? Don't want the pulley self destructing at 6,000 rpm.

No lip on the aluminum pulleys? Don't need it to ensure the belt stays put?